/*
 * Copyright (c) 1999-2003, Carnegie Mellon University. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * 3. Products derived from the software may not be called "iVProg",
 *    nor may "iVProg" appear in their name, without prior written
 *    permission of Carnegie Mellon University.
 * 
 * 4. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes software developed by Carnegie Mellon University"
 */

package edu.cmu.cs.stage3.alice.core.question.userdefined;

import edu.cmu.cs.stage3.alice.core.Element;
import edu.cmu.cs.stage3.alice.core.Expression;
import edu.cmu.cs.stage3.alice.core.property.OverridableElementProperty;
import edu.cmu.cs.stage3.alice.core.property.StringProperty;
import edu.cmu.cs.stage3.alice.core.property.ValueProperty;

public class PropertyAssignment extends Component {
 public final OverridableElementProperty element = new OverridableElementProperty( this, "element", null );
 public final StringProperty propertyName = new StringProperty( this, "propertyName", null );
 public final ValueProperty value = new ValueProperty( this, "value", null );
 private void updateOverrideValueClasses() {
  Class elementOverrideValueClass = null;
  Class valueOverrideValueClass = null;
  String propertyNameValue = propertyName.getStringValue();
  if( propertyNameValue!=null ) {
   Element elementValue = element.getElementValue();
   if( elementValue!=null ) {
    edu.cmu.cs.stage3.alice.core.Property property = elementValue.getPropertyNamed( propertyNameValue );
    if( property != null ) {
     elementOverrideValueClass = property.getDeclaredClass();
     valueOverrideValueClass = property.getValueClass();
    } else {
     if( elementValue instanceof Expression ) {
      Class cls = ((Expression)elementValue).getValueClass();
      if( cls != null ) {
       elementOverrideValueClass = cls;
       valueOverrideValueClass = Element.getValueClassForPropertyNamed( elementOverrideValueClass, propertyNameValue );
      }
     }
    }
   }
  }
  element.setOverrideValueClass( elementOverrideValueClass );
  value.setOverrideValueClass( valueOverrideValueClass );
 }
 //Rem @Override
 protected void propertyChanged( edu.cmu.cs.stage3.alice.core.Property property, Object value ) {
  if( property == element ) {
   updateOverrideValueClasses();
  } else if( property == propertyName ) {
   updateOverrideValueClasses();
  } else {
   super.propertyChanged( property, value );
  }
 }
 //Rem @Override
 public Object[] execute() {
  element.getElementValue().getPropertyNamed( propertyName.getStringValue() ).set( value.getValue() );
  return null;
 }

}
